slutty friends

Anon
hey <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> friends 
i'm really struggling because my friend is a huge slut and she admits it, she loves sleeping with people. she's also seventeen. and i try not to judge but i worry so much that when we get to college something bad is going to happen to her. i've tried helping her out for the past two years with several different methods, at this point should i tell her mom?